i was trying to root a samsung galaxy j1 (sm-j110h)
i failed and the phone is stuck on the startin up logo plus there is a red exclamation mark on left top corner
it does not switch on nor off
help please

It's working 100% but doesn't take away the issue. I had the same issue.

Remove the battery then put it back in place. Turn on the phone by pressing the home button several times until you see Samsung logo appeared.... done. But you may have to do the same process from now on.